US20120032503A1 - Electronic system having resistors serially connected - Google Patents
Electronic system having resistors serially connected Download PDFInfo
- Publication number
- US20120032503A1 US20120032503A1 US13/180,807 US201113180807A US2012032503A1 US 20120032503 A1 US20120032503 A1 US 20120032503A1 US 201113180807 A US201113180807 A US 201113180807A US 2012032503 A1 US2012032503 A1 US 2012032503A1
- Authority
- US
- United States
- Prior art keywords
- resistors
- circuit
- patterned
- electronic system
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000758 substrate Substances 0.000 claims abstract description 57
- 239000003990 capacitor Substances 0.000 claims abstract description 43
- 238000013459 approach Methods 0.000 claims abstract description 16
- 238000009499 grossing Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005476 soldering Methods 0.000 description 10
- 230000005855 radiation Effects 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- 239000007769 metal material Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/36—Temperature of vehicle components or parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2270/00—Problem solutions or means not otherwise provided for
- B60L2270/20—Inrush current reduction, i.e. avoiding high currents when connecting the battery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Definitions
- the present invention relates to an electronic system having a resistance circuit in which a plurality of resistors are serially connected with each other.
- an electronic circuit device As an electronic system capable of suppressing the increase in temperatures of electronic parts, an electronic circuit device has been disclosed in Published Japanese Patent First Publication No. 2010-73943.
- This device is provided with an electronic circuit chip, a base substrate and a thermal conductivity member.
- the chip is disposed on the substrate.
- the conductivity member is disposed between the chip and the substrate while being in contact with the chip and the substrate. Therefore, the conductivity member reduces thermal resistance in the route from the chip to the substrate. Accordingly, heat generated in the chip can be efficiently radiated to the outside, and increase in the temperature of the chip can be suppressed.
- Hybrid vehicles have a motor control system in which a high voltage of a direct current source insulated from the vehicle body is changed to an alternating current voltage to apply this alternating current voltage to a vehicle driving motor.
- the control system is provided with a smoothing capacitor to smooth the high direct current voltage.
- the control system When the operation of the control system is started, electric charge supplied from the source is accumulated in the capacitor so as to smooth the high direct current voltage. Thereafter, when the operation of the control system is ended, the source is disconnected from the capacitor, and the charge accumulated in the capacitor is maintained. Therefore, there is a probability that a person coming into contact with the capacitor receives an electric shock.
- reactive power is supplied to the motor so as to generate no torque in the motor. Therefore, the charge accumulated in the capacitor is discharged.
- the control system is provided with a resistance circuit, and charge of the capacitor is discharged through the resistance circuit.
- the resistance circuit is disposed in parallel to the capacitor so as to always discharge charge of the capacitor at a low rate.
- a plurality of resistors having the same resistance values are aligned in a line on the substrate and are serially connected with one another as the resistance circuit.
- each resistor generates heat. Therefore, temperature of each resistor is inevitably increased. Because heat radiating conditions of each resistor depend on the position of the resistor on the substrate and/or the relative position of the resistor to the resistance circuit, temperature of the resistor located at a low heat radiating position is considerably increased.
- a thermal conductivity member is disposed between the resistance circuit and the substrate while being directly in contact with bodies of the serially-connected resistors and the substrate.
- a metallic material such as copper is generally used.
- bodies of the serially-connected resistors are in contact with the same metallic member, the insulation of each resistor from the other resistors cannot be obtained. That is, the motor control system cannot secure the distance for insulation among the resistors of the resistance circuit receiving high voltage.
- An object of the present invention is to provide, with due consideration to the drawbacks of the conventional electronic circuit device, an electronic system, having a resistance circuit composed of a plurality of resistors serially connected with one another, which suppresses the increase in temperatures of the resistors while securing the insulation distance among the resistors.
- an electronic system mounted on a vehicle comprising a smoothing capacitor that accumulates charge of a direct current source insulated from a body of the vehicle to smooth a voltage of the direct current source, and a resistance circuit, having at least three resistors connected in series, that discharges the charge accumulated in the smoothing capacitor.
- the resistor or each of the resistors located at positions different from ends of the series of resistors of the resistance circuit has a resistance value lower than resistance values of the two resistors located on the respective ends of the series of resistors of the resistance circuit.
- each of the resistors when a discharged current flows through the resistance circuit, heat is generated in each of the resistors, and each of the resistors receives heat generated in the other resistors.
- heat received in each of the resistors located at positions different from the ends of the series of resistors is larger than heat received in any of the resistors located on the ends of the series of resistors.
- each of the two resistors located on the ends of the series of resistors can easily and rapidly radiate the heat generated and received in the resistor.
- the temperature increase in the resistors located at positions different from the ends of the series of resistors becomes larger than the temperature increase in the resistors located on the ends of the series of resistors.
- each resistor located at a position different from the ends of the series of resistors is set to have a resistance value lower than resistance values of the two resistors located on the respective ends of the series of resistors of the resistance circuit.
- electric power consumed in each resistor located at a position different from the ends of the series of resistors becomes smaller than electric power consumed in any of the resistors located on the ends of the series of resistors. Therefore, heat generated in each resistor from which it is difficult to radiate heat becomes smaller than heat generated in any resistor from which heat is easily radiated.
- the temperature increase in each resistor from which it is difficult to radiate heat can be suppressed, and the increase in temperatures of the resistors of the resistance circuit can be suppressed within an allowable range.
- the temperature increase in the resistors is suppressed, it is not required to receive heat in a thermal conductive metal, formed of a metallic material, being in contact with the resistors. Accordingly, even when a high voltage is applied to the resistance circuit, the insulation distance among the resistors can be reliably secured.
- FIG. 1 is a circuit view of a motor control system representing an electronic system according to the first embodiment of the present invention
- FIG. 2 is an enlarged view of patterned wires serially connecting resistors with one another on a surface of a substrate according to the first embodiment
- FIG. 3 is an enlarged view of patterned members (indicated by dotted lines) disposed on a surface of the substrate, when being seen from another surface of the substrate, according to the first embodiment;
- FIG. 4 is an enlarged view of patterned wires serially connecting resistors with one another on a surface of a substrate according to the second embodiment of the present invention.
- FIG. 5 is an enlarged view of a patterned member (indicated by a dotted line) disposed on a surface of a substrate, when being seen from another surface of the substrate, according to the second embodiment.
- a motor control system is mounted on a vehicle as an electronic system according to the present invention to control a vehicle driving motor.
- FIG. 1 is a circuit view of a motor control system representing an electronic system according to the first embodiment.
- a motor control system 1 converts a high direct current (dc) voltage (e.g., 288V) outputted from a high voltage battery B 1 (i.e., a direct current source) into a three-phase alternating current (ac) voltage and applies this ac voltage to a vehicle driving motor M 1 to control the motor M 1 .
- the battery B 1 is insulated from the body of the vehicle.
- the control system 1 has a smoothing capacitor 10 , an inverter circuit 11 , a control circuit 12 and a resistance circuit 13 .
- the capacitor 10 accumulates electric charge supplied from the battery B 1 to smooth the high dc voltage of the battery B 1 .
- the first end of the capacitor 10 is connected with the positive electrode of the battery B 1 through a relay R 10
- the second end of the capacitor 10 is connected with the negative electrode of the battery B 1 through a relay R 11 .
- the inverter circuit 11 converts the high dc voltage smoothed by the capacitor 10 to a three-phase ac voltage and applies this ac voltage to the motor M 1 .
- the circuit 11 has a plurality of n-p-n insulated-gate bipolar transistors (IGBTs) 110 to 115 and a plurality of diodes connected with the respective switching elements in parallel.
- the IGBTs 110 and 113 are serially connected with each other to form the u-phase of the ac voltage.
- the IGBTs 111 and 114 are serially connected with each other to form the v-phase of the ac voltage.
- the IGBTs 112 and 115 are serially connected with each other to form the w-phase of the ac voltage.
- emitters of the IGBTs 110 , 111 and 112 are connected with collectors of the IGBTs 113 , 114 and 115 , respectively.
- the group of IGBTs 110 and 113 , the group of IGBTs 111 and 114 and the group of IGBTs 112 and 115 are connected with one another in parallel.
- Collectors of the IGBTs 110 , 111 and 112 are connected with the first end of the capacitor 10
- emitters of the IGBTs 113 , 114 and 115 are connected with the second end of the capacitor 10 .
- Gates of the IGBTs 110 to 115 are connected with the control circuit 12 .
- Serial connecting points of the group of IGBTs 110 and 113 , the group of IGBTs 111 and 114 and the group of IGBTs 112 and 115 are connected with the motor M 1 .
- the control circuit 12 outputs control signals to the bases of the respective IGBTs 110 to 115 according to an instruction received from the outside to control the IGBTs 110 to 115 .
- the resistance circuit 13 always discharges the charge of the capacitor 10 slowly. Therefore, after the operation of the system 1 is stopped, the circuit 13 prevents any person from receiving an electric shock from the capacitor 10 .
- the resistance circuit 13 has a plurality of resistors 130 , 131 , 132 , 133 , 134 , 135 , 136 and 137 serially connected with one another in that order.
- the resistor 130 located at one end of the circuit 13 is connected with the first end of the capacitor 10
- the resistor 137 located at the other end of the circuit 13 is connected with the second end of the capacitor 10 .
- FIG. 2 is an enlarged view of patterned wires serially connecting the resistors 130 to 137 with one another on a part installing surface of the substrate according to the first embodiment
- FIG. 3 is an enlarged view of patterned members (indicated by dotted lines) disposed on a soldering surface of the substrate, when being seen from the part installing surface, according to the first embodiment.
- the front and rear sides in an aligning direction and the right and left in a lateral direction are defined for convenience of explanation.
- the resistance circuit 13 has a substrate 14 and a plurality of patterned wires 140 a , 140 b , 140 c , 140 d , 140 e , 140 f , 140 g , 140 h and 140 i aligned in a line at equal intervals in that order from the rear side to the front side on a part installing surface of the substrate 14 .
- the resistors 130 to 137 of the circuit 13 are disposed on the substrate 14 and the wires 140 a to 140 i on the part installing surface of the substrate 14 .
- the resistors 130 to 137 are aligned substantially in a straight line at equal intervals along the aligning direction from the rear side to the front side in that order.
- the resistors 130 to 137 are chip resistors which have the same surface area on the substrate 14 .
- the patterned wire 140 a connects the resistor 130 and the first end of the capacitor 10 .
- the patterned wires 140 b to 140 h connect the resistors 130 to 137 in series.
- the patterned wire 140 i is connected with the resistor 137 .
- the resistance circuit 13 further has a patterned wire 140 j and a plurality of patterned heat radiating members 142 a , 142 b and 142 c on a soldering surface of the substrate 14 opposite to the part installing surface (see FIG. 3 ).
- the patterned wire 140 j is connected with the second end of the capacitor 10 .
- the patterned wire 140 i has a plurality of via holes 141 i which penetrate through the substrate 14 from the part installing surface to the soldering surface, and each via hole 141 i is filled with a metallic material such as copper.
- the patterned wire 140 i is connected with the patterned wire 140 j through the material of the via holes 141 i .
- the resistor 137 is connected with the second end of the capacitor 10 through the wires 140 i and 140 j .
- the wires 140 a to 141 j and the radiating members 142 a to 142 c are, for example, made of a metallic material such as copper, aluminium or the like.
- the length of the patterned wire 140 i along the aligning direction is set to be larger than lengths of the wires 140 b to 140 h .
- the patterned wire 140 j is formed so as to face the resistors 130 to 137 through the substrate 14 along the thickness direction.
- Each of widths Wp of the wires 140 a to 140 j along the lateral direction is set to be larger than widths Wr of the resistors 130 to 137 .
- the length of the patterned wire 140 a along the aligning direction is set to be larger than lengths of the wires 140 b to 140 h .
- the patterned wires 140 b to 140 d are prolonged toward the right as compared with the patterned wires 140 e to 140 h , so that widths of the wires 140 b to 140 d along the lateral direction are larger than widths of the wires 140 e to 140 h.
- the patterned wire 140 b has a plurality of via holes 141 b
- the patterned wire 140 c has a plurality of via holes 141 c
- the patterned wire 140 d has a plurality of via holes 141 d .
- Each of the via holes 141 b to 141 d penetrates through the substrate 14 from the part installing surface to the soldering surface and is filled with a metallic material such as copper.
- the radiating member 142 a is disposed so as to face the wire 140 b through the substrate 14 along the thickness direction, and the patterned wire 140 b is connected with the radiating member 142 a through the material of the via holes 141 b so as to transfer heat generated in the resistors 130 and 131 from the wire 140 b to the radiating member 142 a .
- the radiating member 142 b is disposed so as to face the wire 140 c through the substrate 14 along the thickness direction, and the patterned wire 140 c is connected with the radiating member 142 b through the material of the via holes 141 c so as to transfer heat generated in the resistors 131 and 132 from the wire 140 c to the radiating member 142 b .
- the radiating member 142 c is disposed so as to face the wire 140 d through the substrate 14 along the thickness direction, and the patterned wire 140 d is connected with the radiating member 142 c through the material of the via holes 141 d so as to transfer heat generated in the resistors 132 and 133 from the wire 140 d to the radiating member 142 c.
- the resistor 130 located at one end of a resistor string (i.e., one end of the series of resistors 130 to 137 ) of the circuit 13 receives heat generated in the resistors 131 to 137 which are positioned only on the front side of the aligning direction.
- the resistor 137 located at the other end of the resistor string of the circuit 13 receives heat generated in the resistors 130 to 136 which are positioned only on the rear side of the aligning direction.
- each of the resistors 131 to 136 located at positions different from any end of the resistor string of the circuit 13 receives heat generated in the other resistors which are positioned on both the front and rear sides of the aligning direction. Therefore, heat received in each of the resistors 130 and 137 are smaller than heat received in each of the resistors 131 and 136 . Because of this positional relationship of the resistors 130 to 137 , the heat generated and received in each of the resistors 130 and 137 can be rapidly and easily radiated to the outside of the control system 1 through the wires 140 a , 140 b , 140 h and 140 i . In contrast, it is difficult to radiate the heat generated and received in each of the resistors 131 and 136 to the outside.
- resistors 130 to 137 generate heat at the same rate, and the temperature increase in each of the resistors 131 to 136 becomes larger than the temperature increase in each of the resistors 130 and 137 .
- resistance values of the resistors 131 to 136 located at positions different from any end of the resistor string of the circuit 13 are set to be lower than resistance values of the resistors 130 to 131 located at the respective ends of the resistor string of the circuit 13 .
- the resistor is set at a lower resistance value.
- the resistor is set at a lower resistance value.
- resistance values of the resistors 131 and 136 are set to be higher than resistance values of the other resistors 132 to 135 , and resistance values of the resistors 132 and 135 are set to be equal to or higher than resistance values of the resistors 133 and 134 .
- the resistors 133 and 134 located in the center of the resistor string of the circuit 13 are set at the minimum resistance values.
- the thickness of the resistors 130 to 137 are, for example, adjusted.
- resistance values of the resistors 130 to 137 are set at 51 ⁇ , 27 ⁇ , 22 ⁇ , 20 ⁇ , 20 ⁇ , 20 ⁇ , 24 ⁇ and 27 ⁇ , respectively.
- temperature increases of the resistors 130 to 137 are suppressed within an allowable range from 30 degrees to 33 degrees.
- the motor control system 1 When an ignition switch (not shown) of the vehicle is turned on, the relays R 10 and R 11 are turned on, and an operation of the control system 1 is started. In response to the turned-on relays R 10 and R 11 , the high dc voltage of the battery B 1 is smoothed in the capacitor 10 , and the control circuit 12 controls switching operations of the IGBTs 110 to 115 composing the inverter circuit 11 . In these switching operations, the circuit 11 converts the high dc voltage smoothed by the capacitor 10 into a three-phase ac voltage and applies this ac voltage to the motor M 1 . Therefore, the system 1 can control the motor M 1 .
- the length of the wire 140 a is larger than lengths of the wires 140 b to 140 h , heat generated in the resistor 130 is efficiently radiated through the wire 140 a at a high heat radiation rate. Because the wires 140 b to 140 d are prolonged along the lateral direction, heat generated in the resistors 130 to 133 is efficiently radiated through the wires 140 b to 140 d at a high heat radiation rate. Because the wire 140 i is prolonged along the aligning direction, heat generated in the resistor 137 is efficiently radiated through the wire 140 i at a high heat radiation rate.
- the wire 140 j faces the resistors 130 to 137 through the substrate 14 along the thickness direction, heat generated in the resistors 130 to 137 can be efficiently radiated to the outside of the control system 1 through the substrate 14 and the wire 140 j at a high heat radiation rate. Therefore, the wire 140 j also acts as a heat radiating member.
- the control system 1 can prevent any person from receiving an electric shock.
- the increase in the temperature of the resistors 130 to 137 of the resistance circuit 13 will be described.
- heat is generated in each of the resistors 130 to 137 , and temperatures of the resistors 130 to 137 are increased.
- the resistors 130 to 137 are aligned in a straight line at equal intervals so as to differentiate a heat receiving rate of each resistor from heat receiving rates of the other resistors. Therefore, resistance values of the resistors 130 to 137 are, respectively, set at 51 ⁇ , 27 ⁇ , 22 ⁇ , 20 ⁇ , 20 ⁇ , 20 ⁇ , 24 ⁇ and 27 ⁇ so as to suppress increased temperatures of the resistors 130 to 137 within an allowable range.
- the total resistance value of the circuit 13 is 211 ⁇ .
- Experimental results of the temperature increase in the resistors 130 to 137 according to this embodiment were measured when the circuit 13 consumed electric power at a predetermined rate of 1.1 W. Further, as a comparative example based on the prior art, the resistors 130 to 137 were, respectively, set at the same resistance value of 27 ⁇ so as to set the total resistance value of the circuit 13 at 216 ⁇ . Experimental results in the comparative example were also measured when the circuit 13 consumed power at the rate of 1.1 W. Experimental results according to this embodiment and experimental results of the comparative example are shown in Table 1.
- temperature increases in the resistors 130 to 137 were within the narrow range from 31 to 32 degrees. Therefore, temperature increases in the resistors 130 to 137 were within the allowable range from 30 degrees to 33 degrees. In contrast, in the comparative example, temperature increases in the resistors 130 to 137 were widely ranged from 27 degrees to 41 degrees.
- Each of the resistors 130 and 137 located at the ends of the circuit 13 receives heat from the other resistors located only on one side of the series of resistors 130 to 137 , so that the resistor can easily radiate the heat, generated and received in the resistor, to the outside of the control system 1 through the wires 140 a and 140 b or the wires 140 i and 140 j connected to the resistor.
- each of the resistors 131 to 136 located at positions different from any end of the series of resistors 130 to 137 receives heat from the other resistors located on the front and rear sides. Therefore, it is difficult to radiate the heat generated and received in each of the resistors 131 to 136 to the outside.
- resistance values of the resistors 131 to 136 are set to be lower than resistance values of the resistors 130 and 137 . Therefore, heat generated in each of the resistors 131 to 136 , from which it is difficult to radiate heat to the outside, becomes lower than heat generated in each of the resistors 130 and 137 from which heat is easily radiated to the outside.
- the control system 1 can secure the insulation distance among the resistors 130 to 137 of the circuit 13 receiving the high voltage.
- control system 1 having the resistance circuit 13 composed of the resistors 130 to 137 serially connected with one another, can suppress the increase in temperatures of the resistors 130 to 137 while securing the insulation distance among the resistors 130 to 137 .
- each of the resistors 133 and 134 is set to have the lowest resistance value (e.g., 20 ⁇ ). Therefore, heat generated in each of the resistors 133 and 134 , from which it is most difficult to radiate heat, can be most decreased, so that the temperature increase in the resistors 130 to 137 can be reliably suppressed within a predetermined range.
- the resistor is set at a lower resistance value so as to decrease heat generated in the resistor. Accordingly, not only the temperature increase in the resistors 130 and 137 can be suppressed, but also the temperature increase in the resistors 131 to 136 can be reliably suppressed within a predetermined range.
- the resistance values of the resistors 130 to 137 are set such that temperature increases in the resistors 130 to 137 of the circuit 13 consuming electric power at a predetermined rate are placed within the allowable range. Accordingly, temperatures of the resistors 130 to 137 can be uniformly increased within the allowable range.
- widths of the wires 140 a to 140 j are set to be larger than widths of the resistors 130 to 137 . Accordingly, heat of the resistors 130 to 137 can be efficiently radiated through the wires 140 a to 140 j.
- the resistance circuit 13 further has the wire 140 j connected with the wire 140 i . Accordingly, heat generated in the resistor 137 can be efficiently radiated through the wires 140 i and 140 j .
- the wire 140 j is disposed on the soldering surface of the substrate 14 so as to face the resistors 130 to 137 through the substrate 14 . Accordingly, heat generated in the resistors 130 to 137 can be efficiently radiated through the wire 140 j.
- the resistance circuit 13 further has the radiating members 142 a , 142 b and 142 c connected with the wires 140 b , 140 c and 140 d , respectively. Accordingly, heat generated in the resistor 130 to 133 can be efficiently radiated through the radiating members 142 a , 142 b and 142 c , in addition to the heat radiation through the wires 140 b , 140 c and 140 d.
- the length of the wire 140 a along the aligning direction is larger than lengths of the wires 140 b to 140 h . Accordingly, heat generated in the resistor 130 can be efficiently radiated through the wire 140 a.
- the resistance circuit 13 has eight resistors serially connected with one another.
- the circuit 13 may have at least three serially-connected resistors. In this case, resistance values of resistors located at the ends of the circuit 13 are set to be higher than resistance values of the other resistors, and resistors located in the center of the resistor string of the circuit 13 are set at the lowest resistance value. Further, the circuit 13 may have at least five serially-connected resistors. In this case, as the position of one resistor located at a position different from any end of the circuit 13 approaches the center of the resistor string of the circuit 13 , the resistor is set at a lower resistance value. Therefore, in the same manner as in this embodiment, the temperature increase of the resistors can be uniformly suppressed.
- the resistor is set at a lower resistance value.
- the resistors 131 to 136 located at positions different from any end of the resistor string of the circuit 13 may have the same resistance value while the two resistors 130 and 137 located at the ends of the resistor string of the circuit 13 are set at resistance values higher than resistance values of the other resistors 131 to 136 .
- the control system 1 can suppress the increase in temperatures of the resistors 130 to 137 within a predetermined range.
- the resistor 134 adjacent to the resistor 133 located in the center of the resistor string of the circuit 13 has the same resistance value as the resistance value of the resistor 133 .
- the resistor 134 may have a resistance value higher than the resistance value of the resistor 133 . In this case, as the position of one resistor of the circuit 13 approaches the center of the resistor string of the circuit 13 , the resistor is definitely set at a lower resistance value.
- the resistance values of the resistors 130 to 137 are set such that temperature increases in the resistors 130 to 137 of the circuit 13 consuming electric power at a predetermined rate are placed within the allowable range.
- the resistance values of the resistors 130 to 137 may be set such that temperatures of the resistors 130 to 137 of the circuit 13 consuming electric power at a predetermined rate are increased substantially by the same value. In this case, temperature increases in the resistors 130 to 137 can be most suppressed.
- the particular wires 140 b to 140 d have the same number of via holes.
- the number of via holes in the particular wire may be increased.
- the particular wire can more efficiently transfer heat to the corresponding heat radiating member 142 a , 142 b or 142 c . Accordingly, temperature increases of the particular wires can be more reliably suppressed within a predetermined range.
- the resistors 130 to 137 are aligned in a straight line.
- the resistors 130 to 137 may be aligned along a curved line.
- the resistors 130 to 137 are disposed at equal intervals.
- the interval between the resistors may be lengthened.
- the distance from the particular resistor to adjacent resistors is lengthened so as to decrease the heat received from the adjacent resistors. Accordingly, the temperature increase in the resistors located near the center of the resistor string of the circuit 13 can be further reliably suppressed.
- the resistors 130 to 137 are set so as to have the same surface area.
- surface areas of resistors not located on any end of the circuit 13 may be larger than surface areas of resistors located at the ends of the resistor string of the circuit 13 .
- the heat radiation rate from the resistor located at a position different from any end of the circuit 13 can be increased, and the temperature increase in the resistor located at a position different from any end of the circuit 13 can be further reliably suppressed.
- the patterned wires 140 a to 140 j and the patterned heat radiating members 142 a to 142 c are formed on the part installing surface and the soldering surface of the substrate 14 .
- the wires 140 a to 140 j and the members 142 a to 142 c may be formed into the substrate 14 as patterned inner layers of the substrate 14 .
- the resistors 130 to 137 are formed on one surface of the substrate 14 so as to be connected with the inner layers.
- the resistance circuit 13 has one series of resistors 130 to 137 .
- the circuit 13 may have many serial resistor blocks connected with one another in parallel while each serial resistor block is composed of a series of resistors. In this case, the rate of the consumed electric power in the circuit 13 can be increased.
- the widths of the patterned wires 140 a to 140 j along the lateral direction are larger than the widths of the resistors 130 to 137 .
- the surface area of each wire on the part installing surface of the substrate 14 may be larger than the exposed surface area of each of the resistors adjacent to the wire. In this case, in the same manner as in the first embodiment, heat generated in each resistor can be efficiently radiated to the outside through the adjacent wires.
- FIG. 4 is an enlarged view of patterned wires serially connecting resistors of the circuit 13 on the part installing surface of the substrate 14 according to the second embodiment
- FIG. 5 is an enlarged view of a patterned member (indicated by a dotted line) disposed on the soldering surface of the substrate 14 , when being seen from the part installing surface, according to the second embodiment.
- the front and rear sides in the aligning direction and the right and left in the lateral direction are defined for convenience of explanation.
- the control system 1 having the capacitor 10 , the inverter circuit 11 and the control circuit 12 has a resistance circuit 23 in place of the resistance circuit 13 .
- the circuit 23 has a plurality of patterned wires 240 a , 240 b , 240 c , 240 d , 240 e , 240 f , 240 g , 240 h and 240 i disposed on the part installing surface of the substrate 14 while aligning the wires 240 a to 240 i in a line at equal intervals from the rear side to the front side in that order.
- the circuit 23 has a plurality of resistors 230 , 231 , 232 , 233 , 234 , 235 , 236 and 237 disposed on the wires 240 a to 240 i and the substrate 14 on the part installing surface of the substrate 14 while aligning the resistors 230 to 237 substantially in a straight line at equal intervals in that order along the aligning direction from the rear side to the front side.
- the wires 240 a to 240 i serially connect the resistors 230 to 237 with one another.
- the resistors 230 to 237 are chip resistors having the same surface area on the substrate 14 .
- the wire 240 a connects the resistor 230 and the first end of the capacitor 10 .
- the wires 240 b to 240 i connect the resistors 230 to 237 in series.
- the resistance circuit 23 further has a patterned wire 240 j on the soldering surface of the substrate 14 .
- the wire 240 i has a plurality of via holes 241 packed with a metallic material so as to be connected with the wire 240 j . Therefore, the resistor 237 is connected with the second end of the capacitor 10 through the wires 240 i and 240 j .
- the wires 240 a to 241 j are, for example, made of a metallic material such as copper, aluminium or the like.
- Shapes of the wires 240 a , 240 e , 240 f , 240 g , 240 h , 240 i and 240 j are the same as shapes of the wires 140 a , 140 e , 140 f , 140 g , 140 h , 140 i and 140 j shown in FIG. 2 and FIG. 3 , respectively.
- widths of the wires 240 b to 240 d along the lateral direction are smaller than widths of the wires 140 b to 140 d shown in FIG. 2 .
- Resistances of the resistors 230 to 237 are set at predetermined values.
- the resistors 230 and 237 located at both ends of the circuits 23 have resistance values higher than resistance values of the resistors 231 to 236 disposed between the resistors 230 and 237 .
- the resistor is set at a lower resistance value.
- the resistors 233 and 234 disposed in the center of the resistor string of the circuit 24 have lowest resistance values among resistance values of the resistors 230 to 237 .
- the resistance circuit 23 always consumes the electric power of the capacitor 10 little by little, and temperatures of the resistors 230 to 237 are increased. Resistances of the resistors 230 to 237 are set such that temperatures of the resistors 230 to 237 are increased within an allowable range when the circuit 23 consumes the electric power of the capacitor 10 at a predetermined rate.
- the circuit 23 has the wires 240 b to 240 d , of which widths are smaller than widths of the wires 140 b to 140 d shown in FIG. 2 , and has no heat radiating member on the soldering surface of the substrate 14 , the relation among heat radiation rates of the resistors 230 to 237 differs from the relation among heat radiation rates of the resistors 130 to 137 . Therefore, even when the consumed power rate in the circuit 23 is the same as the consumed power rate in the circuit 13 , resistance values of the resistors 230 to 237 according to the second embodiment differ from resistance values of the resistors 130 to 137 according to the first embodiment.
- the control system 1 can suppress the increase in temperatures of the resistors 230 to 237 .
- the control system 1 can secure the insulation distance among the resistors 230 to 237 .
- widths of the patterned wires 240 b to 240 d are shortened as compared with widths of the patterned wires 140 b to 140 d while no heat radiating members connected with the patterned wires 240 b to 240 d are disposed on the soldering surface of the substrate 14 , the area occupied by the patterned wires and members can be decreased.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Inverter Devices (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
- This application is based upon and claims the benefit of priority of the prior Japanese Patent Application 2010-176302 filed on Aug. 5, 2010, so that the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to an electronic system having a resistance circuit in which a plurality of resistors are serially connected with each other.
- 2. Description of Related Art
- As an electronic system capable of suppressing the increase in temperatures of electronic parts, an electronic circuit device has been disclosed in Published Japanese Patent First Publication No. 2010-73943. This device is provided with an electronic circuit chip, a base substrate and a thermal conductivity member. The chip is disposed on the substrate. The conductivity member is disposed between the chip and the substrate while being in contact with the chip and the substrate. Therefore, the conductivity member reduces thermal resistance in the route from the chip to the substrate. Accordingly, heat generated in the chip can be efficiently radiated to the outside, and increase in the temperature of the chip can be suppressed.
- Hybrid vehicles have a motor control system in which a high voltage of a direct current source insulated from the vehicle body is changed to an alternating current voltage to apply this alternating current voltage to a vehicle driving motor. The control system is provided with a smoothing capacitor to smooth the high direct current voltage. When the operation of the control system is started, electric charge supplied from the source is accumulated in the capacitor so as to smooth the high direct current voltage. Thereafter, when the operation of the control system is ended, the source is disconnected from the capacitor, and the charge accumulated in the capacitor is maintained. Therefore, there is a probability that a person coming into contact with the capacitor receives an electric shock. To avoid this problem, under control of a microcomputer of the system, reactive power is supplied to the motor so as to generate no torque in the motor. Therefore, the charge accumulated in the capacitor is discharged. Further, in preparation for a failure occurring in the microcomputer, the control system is provided with a resistance circuit, and charge of the capacitor is discharged through the resistance circuit.
- More specifically, the resistance circuit is disposed in parallel to the capacitor so as to always discharge charge of the capacitor at a low rate. To install the resistance circuit on a base substrate, a plurality of resistors having the same resistance values are aligned in a line on the substrate and are serially connected with one another as the resistance circuit. When the discharging current flows through the resistance circuit, each resistor generates heat. Therefore, temperature of each resistor is inevitably increased. Because heat radiating conditions of each resistor depend on the position of the resistor on the substrate and/or the relative position of the resistor to the resistance circuit, temperature of the resistor located at a low heat radiating position is considerably increased.
- To suppress the increase in temperatures of the resistors, the structure of the electronic circuit device is applied for the control system. More specifically, a thermal conductivity member is disposed between the resistance circuit and the substrate while being directly in contact with bodies of the serially-connected resistors and the substrate. To heighten the thermal conductivity of the member, a metallic material such as copper is generally used. However, because bodies of the serially-connected resistors are in contact with the same metallic member, the insulation of each resistor from the other resistors cannot be obtained. That is, the motor control system cannot secure the distance for insulation among the resistors of the resistance circuit receiving high voltage.
- An object of the present invention is to provide, with due consideration to the drawbacks of the conventional electronic circuit device, an electronic system, having a resistance circuit composed of a plurality of resistors serially connected with one another, which suppresses the increase in temperatures of the resistors while securing the insulation distance among the resistors.
- According to an aspect of this invention, the object is achieved by the provision of an electronic system mounted on a vehicle, comprising a smoothing capacitor that accumulates charge of a direct current source insulated from a body of the vehicle to smooth a voltage of the direct current source, and a resistance circuit, having at least three resistors connected in series, that discharges the charge accumulated in the smoothing capacitor. The resistor or each of the resistors located at positions different from ends of the series of resistors of the resistance circuit has a resistance value lower than resistance values of the two resistors located on the respective ends of the series of resistors of the resistance circuit.
- With this structure of the electronic system, when a discharged current flows through the resistance circuit, heat is generated in each of the resistors, and each of the resistors receives heat generated in the other resistors. In this case, heat received in each of the resistors located at positions different from the ends of the series of resistors is larger than heat received in any of the resistors located on the ends of the series of resistors. In this case, each of the two resistors located on the ends of the series of resistors can easily and rapidly radiate the heat generated and received in the resistor. In contrast, it is difficult to radiate the heat generated and received in each of the resistors located at positions different from the ends of the series of resistors. Therefore, assuming that resistance values of the resistors of the resistance circuit are the same, the temperature increase in the resistors located at positions different from the ends of the series of resistors becomes larger than the temperature increase in the resistors located on the ends of the series of resistors.
- In the present invention, each resistor located at a position different from the ends of the series of resistors is set to have a resistance value lower than resistance values of the two resistors located on the respective ends of the series of resistors of the resistance circuit. In this case, electric power consumed in each resistor located at a position different from the ends of the series of resistors becomes smaller than electric power consumed in any of the resistors located on the ends of the series of resistors. Therefore, heat generated in each resistor from which it is difficult to radiate heat becomes smaller than heat generated in any resistor from which heat is easily radiated.
- Accordingly, the temperature increase in each resistor from which it is difficult to radiate heat can be suppressed, and the increase in temperatures of the resistors of the resistance circuit can be suppressed within an allowable range.
- Further, because the temperature increase in the resistors is suppressed, it is not required to receive heat in a thermal conductive metal, formed of a metallic material, being in contact with the resistors. Accordingly, even when a high voltage is applied to the resistance circuit, the insulation distance among the resistors can be reliably secured.
-
FIG. 1 is a circuit view of a motor control system representing an electronic system according to the first embodiment of the present invention; -
FIG. 2 is an enlarged view of patterned wires serially connecting resistors with one another on a surface of a substrate according to the first embodiment; -
FIG. 3 is an enlarged view of patterned members (indicated by dotted lines) disposed on a surface of the substrate, when being seen from another surface of the substrate, according to the first embodiment; -
FIG. 4 is an enlarged view of patterned wires serially connecting resistors with one another on a surface of a substrate according to the second embodiment of the present invention; and -
FIG. 5 is an enlarged view of a patterned member (indicated by a dotted line) disposed on a surface of a substrate, when being seen from another surface of the substrate, according to the second embodiment. - Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals indicate like parts, members or elements throughout the specification unless otherwise indicated. In each embodiment, a motor control system is mounted on a vehicle as an electronic system according to the present invention to control a vehicle driving motor.
-
FIG. 1 is a circuit view of a motor control system representing an electronic system according to the first embodiment. As shown inFIG. 1 , a motor control system 1 converts a high direct current (dc) voltage (e.g., 288V) outputted from a high voltage battery B1 (i.e., a direct current source) into a three-phase alternating current (ac) voltage and applies this ac voltage to a vehicle driving motor M1 to control the motor M1. The battery B1 is insulated from the body of the vehicle. The control system 1 has asmoothing capacitor 10, aninverter circuit 11, acontrol circuit 12 and aresistance circuit 13. - The
capacitor 10 accumulates electric charge supplied from the battery B1 to smooth the high dc voltage of the battery B1. The first end of thecapacitor 10 is connected with the positive electrode of the battery B1 through a relay R10, while the second end of thecapacitor 10 is connected with the negative electrode of the battery B1 through a relay R11. - The
inverter circuit 11 converts the high dc voltage smoothed by thecapacitor 10 to a three-phase ac voltage and applies this ac voltage to the motor M1. Thecircuit 11 has a plurality of n-p-n insulated-gate bipolar transistors (IGBTs) 110 to 115 and a plurality of diodes connected with the respective switching elements in parallel. TheIGBTs IGBTs IGBTs IGBTs IGBTs IGBTs IGBTs IGBTs IGBTs capacitor 10, while emitters of theIGBTs capacitor 10. Gates of theIGBTs 110 to 115 are connected with thecontrol circuit 12. Serial connecting points of the group ofIGBTs IGBTs IGBTs - The
control circuit 12 outputs control signals to the bases of therespective IGBTs 110 to 115 according to an instruction received from the outside to control theIGBTs 110 to 115. - The
resistance circuit 13 always discharges the charge of thecapacitor 10 slowly. Therefore, after the operation of the system 1 is stopped, thecircuit 13 prevents any person from receiving an electric shock from thecapacitor 10. Theresistance circuit 13 has a plurality ofresistors resistor 130 located at one end of thecircuit 13 is connected with the first end of thecapacitor 10, while theresistor 137 located at the other end of thecircuit 13 is connected with the second end of thecapacitor 10. - The
resistance circuit 13 installed on a substrate will be described with reference toFIG. 2 andFIG. 3 .FIG. 2 is an enlarged view of patterned wires serially connecting theresistors 130 to 137 with one another on a part installing surface of the substrate according to the first embodiment, whileFIG. 3 is an enlarged view of patterned members (indicated by dotted lines) disposed on a soldering surface of the substrate, when being seen from the part installing surface, according to the first embodiment. The front and rear sides in an aligning direction and the right and left in a lateral direction are defined for convenience of explanation. - As shown in
FIG. 2 andFIG. 3 , theresistance circuit 13 has asubstrate 14 and a plurality of patternedwires substrate 14. Theresistors 130 to 137 of thecircuit 13 are disposed on thesubstrate 14 and thewires 140 a to 140 i on the part installing surface of thesubstrate 14. Theresistors 130 to 137 are aligned substantially in a straight line at equal intervals along the aligning direction from the rear side to the front side in that order. Theresistors 130 to 137 are chip resistors which have the same surface area on thesubstrate 14. The patternedwire 140 a connects theresistor 130 and the first end of thecapacitor 10. The patternedwires 140 b to 140 h connect theresistors 130 to 137 in series. The patternedwire 140 i is connected with theresistor 137. - The
resistance circuit 13 further has a patternedwire 140 j and a plurality of patternedheat radiating members substrate 14 opposite to the part installing surface (seeFIG. 3 ). The patternedwire 140 j is connected with the second end of thecapacitor 10. The patternedwire 140 i has a plurality of viaholes 141 i which penetrate through thesubstrate 14 from the part installing surface to the soldering surface, and each viahole 141 i is filled with a metallic material such as copper. The patternedwire 140 i is connected with the patternedwire 140 j through the material of the via holes 141 i. Therefore, theresistor 137 is connected with the second end of thecapacitor 10 through thewires wires 140 a to 141 j and the radiatingmembers 142 a to 142 c are, for example, made of a metallic material such as copper, aluminium or the like. - The length of the patterned
wire 140 i along the aligning direction is set to be larger than lengths of thewires 140 b to 140 h. Further, the patternedwire 140 j is formed so as to face theresistors 130 to 137 through thesubstrate 14 along the thickness direction. Each of widths Wp of thewires 140 a to 140 j along the lateral direction is set to be larger than widths Wr of theresistors 130 to 137. The length of the patternedwire 140 a along the aligning direction is set to be larger than lengths of thewires 140 b to 140 h. The patternedwires 140 b to 140 d are prolonged toward the right as compared with the patternedwires 140 e to 140 h, so that widths of thewires 140 b to 140 d along the lateral direction are larger than widths of thewires 140 e to 140 h. - The patterned
wire 140 b has a plurality of viaholes 141 b, the patternedwire 140 c has a plurality of viaholes 141 c, and the patternedwire 140 d has a plurality of viaholes 141 d. Each of the via holes 141 b to 141 d penetrates through thesubstrate 14 from the part installing surface to the soldering surface and is filled with a metallic material such as copper. The radiatingmember 142 a is disposed so as to face thewire 140 b through thesubstrate 14 along the thickness direction, and the patternedwire 140 b is connected with the radiatingmember 142 a through the material of the via holes 141 b so as to transfer heat generated in theresistors wire 140 b to the radiatingmember 142 a. The radiatingmember 142 b is disposed so as to face thewire 140 c through thesubstrate 14 along the thickness direction, and the patternedwire 140 c is connected with the radiatingmember 142 b through the material of the via holes 141 c so as to transfer heat generated in theresistors wire 140 c to the radiatingmember 142 b. The radiatingmember 142 c is disposed so as to face thewire 140 d through thesubstrate 14 along the thickness direction, and the patternedwire 140 d is connected with the radiatingmember 142 c through the material of the via holes 141 d so as to transfer heat generated in theresistors wire 140 d to the radiatingmember 142 c. - Next, the setting of resistances of the
resistors 130 to 137 will be described. When a discharged current flows through thecircuit 13, heat is generated in each of theresistors 130 to 137 so as to increase temperatures of theresistors 130 to 137. In this case, theresistor 130 located at one end of a resistor string (i.e., one end of the series ofresistors 130 to 137) of thecircuit 13 receives heat generated in theresistors 131 to 137 which are positioned only on the front side of the aligning direction. In the same manner, theresistor 137 located at the other end of the resistor string of thecircuit 13 receives heat generated in theresistors 130 to 136 which are positioned only on the rear side of the aligning direction. In contrast, each of theresistors 131 to 136 located at positions different from any end of the resistor string of thecircuit 13 receives heat generated in the other resistors which are positioned on both the front and rear sides of the aligning direction. Therefore, heat received in each of theresistors resistors resistors 130 to 137, the heat generated and received in each of theresistors wires resistors - In this case, assuming that all the
resistors 130 to 137 have the same resistance value, theresistors 130 to 137 generate heat at the same rate, and the temperature increase in each of theresistors 131 to 136 becomes larger than the temperature increase in each of theresistors resistors 130 to 137 within a predetermined range when theresistance circuit 13 consumes the electric power of thecapacitor 10 at a predetermined rate, resistance values of theresistors 131 to 136 located at positions different from any end of the resistor string of thecircuit 13 are set to be lower than resistance values of theresistors 130 to 131 located at the respective ends of the resistor string of thecircuit 13. - Further, as the position of one resistor of the
circuit 13 approaches the center of the resistor string (i.e., the center of the series ofresistors 130 to 137) of thecircuit 13, heat received in the resistor from the other resistors is increased, and it becomes more difficult to radiate the heat generated and received in the resistor to the outside. In this embodiment, to more reliably suppress temperature increases of theresistors 130 to 137 within an allowable range when theresistance circuit 13 consumes the electric power of thecapacitor 10 at a predetermined rate, as the position of one resistor of thecircuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is set at a lower resistance value. In other words, in addition to the setting of theresistors resistors 130 to 137, as the position of one resistor of thecircuit 13 located at a position different from any end of the resistor string of thecircuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is set at a lower resistance value. - More specifically, resistance values of the
resistors other resistors 132 to 135, and resistance values of theresistors resistors resistors circuit 13 are set at the minimum resistance values. - To set the
resistors 130 to 137 at predetermined resistances, the thickness of theresistors 130 to 137 are, for example, adjusted. For example, resistance values of theresistors 130 to 137 are set at 51Ω, 27Ω, 22Ω, 20Ω, 20Ω, 20Ω, 24Ω and 27Ω, respectively. In this case, when thecircuit 13 consumes electric power at a predetermined rate of 1.1 W so as to radiate heat to the outside of thecircuit 13, temperature increases of theresistors 130 to 137 are suppressed within an allowable range from 30 degrees to 33 degrees. - Next, an operation of the motor control system 1 will be described with reference to
FIG. 1 . When an ignition switch (not shown) of the vehicle is turned on, the relays R10 and R11 are turned on, and an operation of the control system 1 is started. In response to the turned-on relays R10 and R11, the high dc voltage of the battery B1 is smoothed in thecapacitor 10, and thecontrol circuit 12 controls switching operations of theIGBTs 110 to 115 composing theinverter circuit 11. In these switching operations, thecircuit 11 converts the high dc voltage smoothed by thecapacitor 10 into a three-phase ac voltage and applies this ac voltage to the motor M1. Therefore, the system 1 can control the motor M1. - Further, because the length of the
wire 140 a is larger than lengths of thewires 140 b to 140 h, heat generated in theresistor 130 is efficiently radiated through thewire 140 a at a high heat radiation rate. Because thewires 140 b to 140 d are prolonged along the lateral direction, heat generated in theresistors 130 to 133 is efficiently radiated through thewires 140 b to 140 d at a high heat radiation rate. Because thewire 140 i is prolonged along the aligning direction, heat generated in theresistor 137 is efficiently radiated through thewire 140 i at a high heat radiation rate. Because thewire 140 j faces theresistors 130 to 137 through thesubstrate 14 along the thickness direction, heat generated in theresistors 130 to 137 can be efficiently radiated to the outside of the control system 1 through thesubstrate 14 and thewire 140 j at a high heat radiation rate. Therefore, thewire 140 j also acts as a heat radiating member. - Thereafter, when the ignition switch is turned on, the relays R10 and R11 are turned off, and the operation of the control system 1 is stopped. Therefore, the charge accumulated in the
capacitor 10 at the high voltage remains. In this case, because theresistance circuit 13 always discharges the charge of thecapacitor 10 slowly, the accumulated charge is soon dissipated. Therefore, the control system 1 can prevent any person from receiving an electric shock. - Next, the increase in the temperature of the
resistors 130 to 137 of theresistance circuit 13 will be described. When a discharged current flows through thecircuit 13, heat is generated in each of theresistors 130 to 137, and temperatures of theresistors 130 to 137 are increased. As shown inFIG. 2 andFIG. 3 , theresistors 130 to 137 are aligned in a straight line at equal intervals so as to differentiate a heat receiving rate of each resistor from heat receiving rates of the other resistors. Therefore, resistance values of theresistors 130 to 137 are, respectively, set at 51Ω, 27Ω, 22Ω, 20Ω, 20Ω, 20Ω, 24Ω and 27Ω so as to suppress increased temperatures of theresistors 130 to 137 within an allowable range. The total resistance value of thecircuit 13 is 211Ω. - Experimental results of the temperature increase in the
resistors 130 to 137 according to this embodiment were measured when thecircuit 13 consumed electric power at a predetermined rate of 1.1 W. Further, as a comparative example based on the prior art, theresistors 130 to 137 were, respectively, set at the same resistance value of 27Ω so as to set the total resistance value of thecircuit 13 at 216Ω. Experimental results in the comparative example were also measured when thecircuit 13 consumed power at the rate of 1.1 W. Experimental results according to this embodiment and experimental results of the comparative example are shown in Table 1. -
TABLE 1 First Embodiment Comparative Example Resistance Temperature Resistance Temperature Values Increases Values Increases (Ω) (deg.) (Ω) (deg.) R130 51 31 27 27 R131 27 32 27 35 R132 22 32 27 38 R133 20 32 27 41 R134 20 32 27 41 R135 20 32 27 41 R136 24 32 27 40 R137 47 31 27 32 - As shown in Table 1, in the experimental results according to this embodiment, temperature increases in the
resistors 130 to 137 were within the narrow range from 31 to 32 degrees. Therefore, temperature increases in theresistors 130 to 137 were within the allowable range from 30 degrees to 33 degrees. In contrast, in the comparative example, temperature increases in theresistors 130 to 137 were widely ranged from 27 degrees to 41 degrees. - Next, effects in this embodiment will be described.
- Each of the
resistors circuit 13 receives heat from the other resistors located only on one side of the series ofresistors 130 to 137, so that the resistor can easily radiate the heat, generated and received in the resistor, to the outside of the control system 1 through thewires wires resistors 131 to 136 located at positions different from any end of the series ofresistors 130 to 137 receives heat from the other resistors located on the front and rear sides. Therefore, it is difficult to radiate the heat generated and received in each of theresistors 131 to 136 to the outside. To suppress temperature increases in theresistors 130 to 137, resistance values of theresistors 131 to 136 are set to be lower than resistance values of theresistors resistors 131 to 136, from which it is difficult to radiate heat to the outside, becomes lower than heat generated in each of theresistors - Accordingly, not only the temperature increase in the
resistors resistors 131 to 136 can be suppressed within the allowable range. - Further, none of bodies of the
resistors 130 to 137 is in contact with the same thermal conductive member, but each of thewires 140 b to 140 h are located only between two resistors of thecircuit 13. Therefore, the control system 1 can secure the insulation distance among theresistors 130 to 137 of thecircuit 13 receiving the high voltage. - Accordingly, the control system 1, having the
resistance circuit 13 composed of theresistors 130 to 137 serially connected with one another, can suppress the increase in temperatures of theresistors 130 to 137 while securing the insulation distance among theresistors 130 to 137. - Further, it is most difficult to radiate heat from the
resistors circuit 13, to the outside. However, in this embodiment, each of theresistors resistors resistors 130 to 137 can be reliably suppressed within a predetermined range. - Moreover, as the position of one resistor of the
circuit 13 approaches the center of the resistor string of thecircuit 13, heat received in the resistor from the other resistors is increased, and it becomes more difficult to radiate the heat generated and received in the resistor to the outside. To compensate for the increase of the received heat, in this embodiment, as the position of one resistor of thecircuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is set at a lower resistance value so as to decrease heat generated in the resistor. Accordingly, not only the temperature increase in theresistors resistors 131 to 136 can be reliably suppressed within a predetermined range. - Furthermore, the resistance values of the
resistors 130 to 137 are set such that temperature increases in theresistors 130 to 137 of thecircuit 13 consuming electric power at a predetermined rate are placed within the allowable range. Accordingly, temperatures of theresistors 130 to 137 can be uniformly increased within the allowable range. - Still further, widths of the
wires 140 a to 140 j are set to be larger than widths of theresistors 130 to 137. Accordingly, heat of theresistors 130 to 137 can be efficiently radiated through thewires 140 a to 140 j. - Still further, the
resistance circuit 13 further has thewire 140 j connected with thewire 140 i. Accordingly, heat generated in theresistor 137 can be efficiently radiated through thewires wire 140 j is disposed on the soldering surface of thesubstrate 14 so as to face theresistors 130 to 137 through thesubstrate 14. Accordingly, heat generated in theresistors 130 to 137 can be efficiently radiated through thewire 140 j. - Still further, the
resistance circuit 13 further has the radiatingmembers wires resistor 130 to 133 can be efficiently radiated through the radiatingmembers wires - Still further, the length of the
wire 140 a along the aligning direction is larger than lengths of thewires 140 b to 140 h. Accordingly, heat generated in theresistor 130 can be efficiently radiated through thewire 140 a. - In this embodiment, the
resistance circuit 13 has eight resistors serially connected with one another. However, this embodiment should not be construed as limiting the present invention to the structure of this embodiment. Thecircuit 13 may have at least three serially-connected resistors. In this case, resistance values of resistors located at the ends of thecircuit 13 are set to be higher than resistance values of the other resistors, and resistors located in the center of the resistor string of thecircuit 13 are set at the lowest resistance value. Further, thecircuit 13 may have at least five serially-connected resistors. In this case, as the position of one resistor located at a position different from any end of thecircuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is set at a lower resistance value. Therefore, in the same manner as in this embodiment, the temperature increase of the resistors can be uniformly suppressed. - Further, in this embodiment, as the position of one resistor of the
circuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is set at a lower resistance value. However, theresistors 131 to 136 located at positions different from any end of the resistor string of thecircuit 13 may have the same resistance value while the tworesistors circuit 13 are set at resistance values higher than resistance values of theother resistors 131 to 136. With this structure of the control system 1, the control system 1 can suppress the increase in temperatures of theresistors 130 to 137 within a predetermined range. - Moreover, in this embodiment, the
resistor 134 adjacent to theresistor 133 located in the center of the resistor string of thecircuit 13 has the same resistance value as the resistance value of theresistor 133. However, theresistor 134 may have a resistance value higher than the resistance value of theresistor 133. In this case, as the position of one resistor of thecircuit 13 approaches the center of the resistor string of thecircuit 13, the resistor is definitely set at a lower resistance value. - Furthermore, in this embodiment, the resistance values of the
resistors 130 to 137 are set such that temperature increases in theresistors 130 to 137 of thecircuit 13 consuming electric power at a predetermined rate are placed within the allowable range. However, the resistance values of theresistors 130 to 137 may be set such that temperatures of theresistors 130 to 137 of thecircuit 13 consuming electric power at a predetermined rate are increased substantially by the same value. In this case, temperature increases in theresistors 130 to 137 can be most suppressed. - Still further, in this embodiment, the
particular wires 140 b to 140 d have the same number of via holes. However, as the position of one particular wire approaches the center of the resistor string of thecircuit 13, the number of via holes in the particular wire may be increased. In this case, as heat received in the particular wire from the other wires is increased, the particular wire can more efficiently transfer heat to the correspondingheat radiating member - Still further, in this embodiment, the
resistors 130 to 137 are aligned in a straight line. However, theresistors 130 to 137 may be aligned along a curved line. - Still further, in this embodiment, the
resistors 130 to 137 are disposed at equal intervals. However, as the position of the gap between two resistors approaches the center of the resistor string of thecircuit 13, the interval between the resistors may be lengthened. In this case, as the position of one particular resistor approaches the center of the resistor string of thecircuit 13, the distance from the particular resistor to adjacent resistors is lengthened so as to decrease the heat received from the adjacent resistors. Accordingly, the temperature increase in the resistors located near the center of the resistor string of thecircuit 13 can be further reliably suppressed. - Still further, in this embodiment, the
resistors 130 to 137 are set so as to have the same surface area. However, surface areas of resistors not located on any end of thecircuit 13 may be larger than surface areas of resistors located at the ends of the resistor string of thecircuit 13. In this case, the heat radiation rate from the resistor located at a position different from any end of thecircuit 13 can be increased, and the temperature increase in the resistor located at a position different from any end of thecircuit 13 can be further reliably suppressed. - Still further, in this embodiment, the patterned
wires 140 a to 140 j and the patternedheat radiating members 142 a to 142 c are formed on the part installing surface and the soldering surface of thesubstrate 14. However, thewires 140 a to 140 j and themembers 142 a to 142 c may be formed into thesubstrate 14 as patterned inner layers of thesubstrate 14. In this case, theresistors 130 to 137 are formed on one surface of thesubstrate 14 so as to be connected with the inner layers. - Still further, in this embodiment, the
resistance circuit 13 has one series ofresistors 130 to 137. However, thecircuit 13 may have many serial resistor blocks connected with one another in parallel while each serial resistor block is composed of a series of resistors. In this case, the rate of the consumed electric power in thecircuit 13 can be increased. - Still further, in this embodiment, the widths of the patterned
wires 140 a to 140 j along the lateral direction are larger than the widths of theresistors 130 to 137. However, when all the surface area of each resistor not being in contact with thesubstrate 14 or any wire is called an exposed surface area, the surface area of each wire on the part installing surface of thesubstrate 14 may be larger than the exposed surface area of each of the resistors adjacent to the wire. In this case, in the same manner as in the first embodiment, heat generated in each resistor can be efficiently radiated to the outside through the adjacent wires. -
FIG. 4 is an enlarged view of patterned wires serially connecting resistors of thecircuit 13 on the part installing surface of thesubstrate 14 according to the second embodiment, whileFIG. 5 is an enlarged view of a patterned member (indicated by a dotted line) disposed on the soldering surface of thesubstrate 14, when being seen from the part installing surface, according to the second embodiment. The front and rear sides in the aligning direction and the right and left in the lateral direction are defined for convenience of explanation. - As shown in
FIG. 4 andFIG. 5 , the control system 1 having thecapacitor 10, theinverter circuit 11 and thecontrol circuit 12 has aresistance circuit 23 in place of theresistance circuit 13. Thecircuit 23 has a plurality of patternedwires substrate 14 while aligning thewires 240 a to 240 i in a line at equal intervals from the rear side to the front side in that order. Thecircuit 23 has a plurality ofresistors wires 240 a to 240 i and thesubstrate 14 on the part installing surface of thesubstrate 14 while aligning theresistors 230 to 237 substantially in a straight line at equal intervals in that order along the aligning direction from the rear side to the front side. Thewires 240 a to 240 i serially connect theresistors 230 to 237 with one another. Theresistors 230 to 237 are chip resistors having the same surface area on thesubstrate 14. - The
wire 240 a connects theresistor 230 and the first end of thecapacitor 10. Thewires 240 b to 240 i connect theresistors 230 to 237 in series. Theresistance circuit 23 further has a patternedwire 240 j on the soldering surface of thesubstrate 14. Thewire 240 i has a plurality of viaholes 241 packed with a metallic material so as to be connected with thewire 240 j. Therefore, theresistor 237 is connected with the second end of thecapacitor 10 through thewires wires 240 a to 241 j are, for example, made of a metallic material such as copper, aluminium or the like. - Shapes of the
wires wires FIG. 2 andFIG. 3 , respectively. In contrast, widths of thewires 240 b to 240 d along the lateral direction are smaller than widths of thewires 140 b to 140 d shown inFIG. 2 . - Resistances of the
resistors 230 to 237 are set at predetermined values. Theresistors circuits 23 have resistance values higher than resistance values of theresistors 231 to 236 disposed between theresistors circuit 23 approaches the center of the resistor string of thecircuit 23, the resistor is set at a lower resistance value. Theresistors circuit 24 have lowest resistance values among resistance values of theresistors 230 to 237. - Further, the
resistance circuit 23 always consumes the electric power of thecapacitor 10 little by little, and temperatures of theresistors 230 to 237 are increased. Resistances of theresistors 230 to 237 are set such that temperatures of theresistors 230 to 237 are increased within an allowable range when thecircuit 23 consumes the electric power of thecapacitor 10 at a predetermined rate. - Because the
circuit 23 has thewires 240 b to 240 d, of which widths are smaller than widths of thewires 140 b to 140 d shown inFIG. 2 , and has no heat radiating member on the soldering surface of thesubstrate 14, the relation among heat radiation rates of theresistors 230 to 237 differs from the relation among heat radiation rates of theresistors 130 to 137. Therefore, even when the consumed power rate in thecircuit 23 is the same as the consumed power rate in thecircuit 13, resistance values of theresistors 230 to 237 according to the second embodiment differ from resistance values of theresistors 130 to 137 according to the first embodiment. - Accordingly, because resistances of the
resistors 230 to 237 are set such that temperatures of theresistors 230 to 237 are increased within an allowable range when thecircuit 23 consumes the electric power of thecapacitor 10 at a predetermined rate, the control system 1 can suppress the increase in temperatures of theresistors 230 to 237. - Further, because the
resistors 230 to 237 are connected with thewires 240 a to 240 i separated from one another, the control system 1 can secure the insulation distance among theresistors 230 to 237. - Moreover, because widths of the patterned
wires 240 b to 240 d are shortened as compared with widths of the patternedwires 140 b to 140 d while no heat radiating members connected with the patternedwires 240 b to 240 d are disposed on the soldering surface of thesubstrate 14, the area occupied by the patterned wires and members can be decreased.
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010176302A JP5104923B2 (en) | 2010-08-05 | 2010-08-05 | Electronic equipment |
JP2010-176302 | 2010-08-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120032503A1 true US20120032503A1 (en) | 2012-02-09 |
US8674540B2 US8674540B2 (en) | 2014-03-18 |
Family
ID=45555617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/180,807 Active 2032-02-20 US8674540B2 (en) | 2010-08-05 | 2011-07-12 | Electronic system having resistors serially connected |
Country Status (3)
Country | Link |
---|---|
US (1) | US8674540B2 (en) |
JP (1) | JP5104923B2 (en) |
CN (1) | CN102398553B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140369099A1 (en) * | 2013-06-18 | 2014-12-18 | Denso Corporation | Power converter including smoothing capacitor and discharge resistor |
US20170141697A1 (en) * | 2014-07-31 | 2017-05-18 | Aisin Aw Co., Ltd. | Control board for power conversion device |
US11529885B2 (en) * | 2017-03-08 | 2022-12-20 | Valeo Equipements Electriques Moteur | Electric circuit for discharging a capacitor, electric system and motor vehicle comprising such an electric discharge circuit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040004535A1 (en) * | 2001-10-23 | 2004-01-08 | Lsi Logic Corporation | Low temperature coefficient resistor |
US20100072574A1 (en) * | 2008-09-25 | 2010-03-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor Device and Manufacturing Method Thereof |
US8169782B2 (en) * | 2009-07-10 | 2012-05-01 | Aisin Aw Co., Ltd. | Electronic circuit device |
US8338714B2 (en) * | 2010-03-31 | 2012-12-25 | Samsung Electro-Mechanics Co., Ltd. | Heat-radiating substrate and manufacturing method thereof |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH051286A (en) | 1991-06-26 | 1993-01-08 | Mitsubishi Kasei Corp | Liquid crystal composition and liquid crystal display device |
JP2005102464A (en) * | 2003-08-25 | 2005-04-14 | Toyota Motor Corp | Power supply device and automobile equipped with the same |
DE10360553A1 (en) * | 2003-12-22 | 2005-07-14 | BSH Bosch und Siemens Hausgeräte GmbH | Current sensor for monitoring overheating of heating elements |
JP4737093B2 (en) * | 2007-01-09 | 2011-07-27 | 株式会社デンソー | Control device for multiphase rotating electrical machine |
WO2009005108A1 (en) * | 2007-06-29 | 2009-01-08 | Koa Corporation | Resistor |
JP4829279B2 (en) | 2008-08-27 | 2011-12-07 | 株式会社東芝 | Circuit unit heat dissipation structure |
JP2010073943A (en) * | 2008-09-19 | 2010-04-02 | Fdk Corp | Electronic circuit device |
JP2010118430A (en) * | 2008-11-12 | 2010-05-27 | Taiyosha Electric Co Ltd | Chip resistor |
-
2010
- 2010-08-05 JP JP2010176302A patent/JP5104923B2/en active Active
-
2011
- 2011-07-12 US US13/180,807 patent/US8674540B2/en active Active
- 2011-08-03 CN CN201110225266.2A patent/CN102398553B/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040004535A1 (en) * | 2001-10-23 | 2004-01-08 | Lsi Logic Corporation | Low temperature coefficient resistor |
US20100072574A1 (en) * | 2008-09-25 | 2010-03-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor Device and Manufacturing Method Thereof |
US8169782B2 (en) * | 2009-07-10 | 2012-05-01 | Aisin Aw Co., Ltd. | Electronic circuit device |
US8338714B2 (en) * | 2010-03-31 | 2012-12-25 | Samsung Electro-Mechanics Co., Ltd. | Heat-radiating substrate and manufacturing method thereof |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140369099A1 (en) * | 2013-06-18 | 2014-12-18 | Denso Corporation | Power converter including smoothing capacitor and discharge resistor |
US9300221B2 (en) * | 2013-06-18 | 2016-03-29 | Denso Corporation | Power converter including smoothing capacitor and discharge resistor |
US20170141697A1 (en) * | 2014-07-31 | 2017-05-18 | Aisin Aw Co., Ltd. | Control board for power conversion device |
US11529885B2 (en) * | 2017-03-08 | 2022-12-20 | Valeo Equipements Electriques Moteur | Electric circuit for discharging a capacitor, electric system and motor vehicle comprising such an electric discharge circuit |
Also Published As
Publication number | Publication date |
---|---|
JP2012039715A (en) | 2012-02-23 |
CN102398553A (en) | 2012-04-04 |
US8674540B2 (en) | 2014-03-18 |
JP5104923B2 (en) | 2012-12-19 |
CN102398553B (en) | 2014-11-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5622043B2 (en) | Inverter device | |
JP6919348B2 (en) | Power converter | |
EP3386277B1 (en) | Heat-dissipating substrate and electrically driven power steering device | |
US9425707B2 (en) | Inverter device capable of appropriately fixing a power module having a switching element and a smoothing capacitor in a limited region | |
KR101522089B1 (en) | Semiconductor unit | |
JP6208326B2 (en) | Power conversion unit, power conversion device, and power conversion method | |
GB2541966B (en) | Power converter and railway vehicle | |
US7859105B2 (en) | Power converter, power system provided with same, and mobile body | |
CN105471328A (en) | Electrical rotating machine controller | |
US20120248909A1 (en) | Inverter device | |
JPH1098887A (en) | Power converter | |
US9117789B2 (en) | Semiconductor device | |
WO2019026339A1 (en) | Power conversion device and vehicle equipped with power conversion device | |
US8674540B2 (en) | Electronic system having resistors serially connected | |
JP2013126360A (en) | Discharge device and noise reduction device of electric power conversion apparatus | |
JP2019033587A (en) | Power converter and vehicle equipped with power converter | |
US9999119B2 (en) | Electronic control unit | |
CN113708668A (en) | Discrete IGBT parallel power assembly and dual-motor driving system | |
US11292511B2 (en) | Electronic control unit and electric power steering apparatus having the same | |
EP2958842B1 (en) | Low profile drive unit for elevator system | |
US20120307468A1 (en) | Electronic apparatus | |
TW202234434A (en) | Inverter unit, motor unit and vehicle an inverter device, comprising: a power module, a capacitor module and plate-shaped positive and negative bus bars | |
JPH06303704A (en) | Driving device for electric vehicle | |
JP6713246B2 (en) | Power converter | |
CN111600169A (en) | Switching copper bar |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DENSO CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ITOU, AKITO;REEL/FRAME:026577/0223 Effective date: 20110703 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551) Year of fee payment: 4 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 8 |